When you see the next four Stan Lee's Marvel Studios cameos starting this week in "Doctor Strange," we now know that you're seeing the work of "Guardians of the Galaxy" director James Gunn. Last week it was revealed that Gunn was behind the camera for all four of Stan Lee's upcoming cameos. Now the director has taken to Facebook to talk about the experience -- and he had nothing but great things to say about his Stan Lee team-up.

"[I]t was definitely one of the most fun times I've ever had on set," wrote Gunn in his Facebook post, seen below. "There are few people in this world I love and admire more and have more fun with than Stan Lee." Gunn added that Stan Lee loves giving everyone a hard time, even new Spider-Man actor Tom Holland; upon meeting the actor, Lee jokingly said, "Everyone says you're great! Personally, I don't see it."

Gunn also offered up some clarification about the "four cameos" headline, although that clarification came with a vague hint. "I think I only did THREE cameos -- one was shot by someone else," wrote Gunn. "And my third probably isn't what you think it is..."

The director also wrote about the Stan Lee cameo as seen in "Doctor Strange." "If you've seen the 'Doctor Strange' cameo, it was one of MANY versions I shot on the day, and Scott Derrickson chose the final one," wrote Gunn. "If I'm writing for Stan, why give him one line when I can give him a thousand? I just kept throwing lines at him one after the other, until we were all doubled over with laughter. Someday, after you've seen the movie, maybe Marvel Studios will let me share some of those with you."

Director Scott Derrickson previously spoke about the process, which saw Gunn working hard to match Derrickson's work on "Strange. "“James was texting me the frame," said Derrickson last week. "Does this look right? Does this look good?”

Given Marvel Studios’ release schedule, it’s presumed the 93-year-old Lee filmed scenes not only for “Doctor Strange” and “Guardians of the Galaxy Vol. 2,” but also “Spider-Man: Homecoming” and “Thor: Ragnarok.” The latter three films all drop in 2017.

“They’re all awesome! They’re all totally different,” said Marvel Studios President Kevin Feige last month about Lee's quartet of cameos. “And he was unbelievable. He was on fire. He came in, he sat here, he stood there, he stood in this window, and then he went home.”

"Doctor Strange" arrives in theaters on November 4.